MAYOR Bloomberg places so much trust in First Deputy Mayor Patti Harris that he’s allowed her to select his burial plot without telling him where it is.

That’s just one of the juicy tidbits served up in the biography “Mike Bloomberg: Money, Power, Politics,” coming out Tuesday.

Author Joyce Purnick describes Harris, who joined Bloomberg’s company in 1994 and moved with him to City Hall in 2002, as “fiercely loyal and unequaled in power.”

“She even picked his burial spot, Bloomberg revealed airily one day — somewhere in New York City, though he does not know where,” Purnick reported. “He does not have to know. Patti Harris does.”

Other choice revelations in the generally positive bio:

* Bloomberg’s need to lead was obvious at an early age.

“He wanted to be the boss of whatever we were working on,” recalled Charlotte Bloomberg, the mayor’s mom. “He wanted to run everything.”

* Mike was “not a big fan” of Barack Obama before the election.

“Though neutral in public about the presidential contest, the mayor privately called Obama inexperienced at running things and too willing to make political compromises,” Purnick wrote.

* One unnamed close friend, who encouraged Bloomberg’s third-term bid, confided he was sure the mayor “ran out the clock” on changing the term-limit law through a public referendum — where it would probably have been rejected — so he could muscle it through the City Council.

! Before becoming mayor, Bloomberg had a reputation for cursing up a storm.

“Do you have any idea of the dirty mouth the guy has? He used to be impossible. But . . . he adapted,” said old pal Harvey Eisen.

Purnick also reported that the mayor has regaled people with “colorful fantasies about how he would like to entertain Salma Hayek at Gracie Mansion.”